Thermophoretic fractionalization of small particles

A technology of particles and conductive particles, which is applied in the field of solid conductive nanoparticles or semiconductive nanoparticles, and can solve the problem that the conductivity of nanotubes does not reach that of nanotubes.

Inactive Publication Date: 2009-05-13
FURAKAWA ELECTRIC NORTH AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, the differences in nanotube conductivity have not reached the point where efficient techniques can be used to fabricate nanotubes with uniform conductivity

Method used

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  • Thermophoretic fractionalization of small particles
  • Thermophoretic fractionalization of small particles
  • Thermophoretic fractionalization of small particles

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Embodiment Construction

[0011] For comparison with the method of the present invention, refer to figure 1 , showing the conventional thermophoresis method. exist figure 1 In , solution 11 is shown, which includes a carrier liquid and particles. These particles are typically polymers, glass such as silica, or one of a wider variety of particles or mixtures of particles processed by known thermophoretic methods. The solution is contained between the walls of the vessel; a cold wall 12 cooled by cooling means indicated at 13 , and a warm wall 13 cooled by cooling means indicated at element 15 . When a temperature gradient develops in the liquid adjacent to the cold wall 12, particles from the liquid carrier 11 can deposit on the surface of the cold wall. this is in figure 2 is shown in , where particles 17 are attached to the surface of element 12 .

[0012] A variant of thermophoretic processing is applied to the separation method of the present invention. It was found that efficient gradients f...

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Abstract

Described is a method for fractionalizing nanoparticles according to the conductivity of the particle, thus enabling the production of large numbers of particles with uniform conductivity. The method is based on a modified thermophoresis process wherein a temperature gradient is produced in a mixture of particles and the most conductive particles are selectively deposited on a warm surface. In contrast to conventional thermophoresis methods, the temperature gradient that drives the fractionalization process is produced using a light source.

Description

[0001] related application [0002] This application is related to Application Serial No. 11 / 589012, filed October 27, 2006, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention involves the separation of small solid conductive nanoparticles or semiconductive nanoparticles using a modified thermophoretic technique according to the conductivity of the particles. Background technique [0004] The effects of various fields, such as electric, magnetic, thermal, on small particles have been extensively studied. The least understood of these is the effect of thermal gradients on particles in liquids. This effect is commonly known as thermophoresis. It is well known that in a suspension of particles, particles can move in a controlled manner if a thermal gradient is created in the liquid. The variables in this process are very complex and include, among others, thermal gradients, several properties of the particles, properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D57/00
CPCC01B31/0253B82Y40/00B82Y30/00C01B32/168
Inventor D·J·迪乔瓦尼J·尼科尔森
Owner FURAKAWA ELECTRIC NORTH AMERICA INC
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